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Primary dendrite arm spacing (PDAS) of α phase in directionally solidified Pb-26%Bi (mass fraction) hypo-peritectic alloys was measured by considering the effect of melt convection in cylindrical samples with different diameters. The experimental results show the measured PDAS increases with increasing diameter of the sample. At the growth velocity of 5 μm/s, its value changes from 161.5 μm for the...
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